battery saver?

Discussion in 'The Projects Forum' started by burtS, Aug 4, 2012.

  1. burtS

    Thread Starter Member

    Mar 6, 2008
    29
    0
    I have a simple Darlington circuit that can operate anywhere between 3v and higher. I want to run it using a 9v battery. Would I lengthen the life of the battery by using a zener to decrease battery output to 6v or less?
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,431
    3,360
    No. Any excess energy is wasted as heat generated in the zener.
    What you need is an efficient DC-DC converter that drops the 9VDC down to 3VDC.
     
  3. crutschow

    Expert

    Mar 14, 2008
    12,995
    3,229
    What does the circuit do?
     
  4. burtS

    Thread Starter Member

    Mar 6, 2008
    29
    0
    It's a dual channel touch detector, output of each channel also signaled by an LED.
     
  5. burtS

    Thread Starter Member

    Mar 6, 2008
    29
    0
    Thanks for the fast reply. DC-DC converters appear to be rather expensive, much cheaper to replace battery when needed!
     
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